Which of the following represents an accurate statement concerning arthropods?,They possess an exoskeleton composed primarily of peptidoglycan.,They possess an open circulatory system with a dorsal heart.,They are members of a biologically unsuccessful phylum incapable of exploiting diverse habitats and nutrition sources.,"They lack paired, jointed appendages.",B
"In a given population, 1 out of every 400 people has a cancer caused by a completely recessive allele, b. Assuming the population is in Hardy-Weinberg equilibrium, which of the following is the expected proportion of individuals who carry the b allele but are not expected to develop the cancer?",1/400,19/400,20/400,38/400,D
"The presence of homologous structures in two different organisms, such as the humerus in the front limb of a human and a bird, indicates that",the human and bird are polyphyletic species,a human's and bird's evolution is convergent,the human and bird belong to a clade,the human and bird developed by analogy,C
"According to the pressure-flow model of movement of phloem contents, photosynthate movement from source to sink is driven by",an ATP-dependent pressure-flow pump,a water-pressure potential gradient,transpiration,apoplastic diffusion,B
Which of the following contain DNA sequences required for the segregation of chromosomes in mitosis and meiosis?,Telomeres,Centromeres,Nucleosomes,Spliceosomes,B
